Question 11 : Which of the following ions has a pseudo-noble-gas electron configuration?
1. Fe₂⁺
2. Cu⁺
3. Ni⁺
4. Mn2 +
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Question 12 : How many valence electrons are transferred from the calcium atom to iodine in the formation of the compound calcium iodide?
1. 1
2. 2
3. 0
4. 3
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Question 13 : What is the net charge of the ionic compound calcium fluoride?
1. 2^-
2. 1^-
3. 0
4. 1⁺
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Question 14 : What is the charge on the cation in the ionic compound sodium sulfide?
1. 0
2. 2⁺
3. 1⁺
4. 3⁺
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Question 15 : What is the formula of the ion formed when potassium achieves noble-gas electron configuration?
1. K⁺
2. K2^-
3. K_2⁺
4. K1^-
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Question 16 : How many electrons does barium have to give up to achieve a noble-gas electron configuration?
1. 2
2. 3
3. 4
4. 1
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Question 17 : Which of the following occurs in an ionic bond?
1. Two atoms share two electrons.
2. Two atoms share more than two electrons.
3. Like-charged ions attract.
4. Oppositely charged ions attract.
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Question 18 : How does calcium obey the octet rule when reacting to form compounds?
1. It gains electrons.
2. It gives up electrons.
3. It does not change its number of electrons.
4. Calcium does not obey the octet rule.
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Question 19 : What is the name given to the electrons in the highest occupied energy level of an atom?
1. orbital electrons
2. anions
3. valence electrons
4. cations
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Question 20 : The electron dot formula for O₂ shows:
1. a double covalent bond
2. a total of 8 × 2 = 16 electron dots
3. a single covalent bond
4. an ionic bond
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